/*
 * Copyright (c) 2017, cxy7.com
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.b3log.solo.util.comparator;

import java.util.Comparator;

import org.b3log.solo.model.Tag;
import org.json.JSONObject;

/**
 * Tag comparator by reference count descent.
 *
 * @author <a href="http://cxy7.com">XyCai</a>
 * @version 1.0.0.2, Jul 24, 2014
 */
public final class TagRefCntComparator implements Comparator<JSONObject> {

	/**
	 * Package default constructor.
	 */
	TagRefCntComparator() {
	}

	@Override
	public int compare(final JSONObject tag1, final JSONObject tag2) {
		try {
			final Integer refCnt1 = tag1.getInt(Tag.TAG_REFERENCE_COUNT);
			final Integer refCnt2 = tag2.getInt(Tag.TAG_REFERENCE_COUNT);

			return refCnt2.compareTo(refCnt1);
		} catch (final Exception e) {
			throw new IllegalStateException(e);
		}
	}
}
